System Board Description; Figure 10-1 - Sun Microsystems SPARCcenter 2000 Service Manual

10

10.3 System Board Description

Diagnostic LEDs
RS232 connector A
Keyboard and Mouse connector
RS232 connector B
10-2
•
Do not place the board or cards on a hard surface. Use a cushioned antistatic
mat. board connectors and components have very thin pins that bend easily.
•
Do not use an oscilloscope probe on the components. The soldered pins are
easily damaged or shorted by the probe point.
•
Transport the board in an antistatic bag.
Protect yourself and the equipment by observing the following precautions
presented in Chapter 5, Table 5-1.
Figure 10-1 shows the major components on the system board.
End view
0
SBus
slot 0
1
SBus
slot 1
A
2
SBus
slot 2
B
3
SBus
slot 3
Figure 10-1 System Board
Minimum configuration for the board in slot 0, the system master, is a
SuperSPARC module in location A. See the note below.
Note – A system board can be moved to any slot, especially during
troubleshooting. However, by convention, the system master is in slot 0. The
factory ships systems in this configuration. It is possible POST may assign a
new system master in a different slot if the original system master fails. If this
occurs, correct it and install a fully functional system board in slot 0.
SPARCcenter 2000/2000E Service Manual—June 1996
Side view
Super- Super-
SPARC SPARC
mod- mod-
ule A ule B
SIMM
groups
XDBus connector 1
XDBus connector 0